D3 interactive datatable

D3 Interactive Data Table

Overview

Create HTML <table> elements using D3's data join pattern, with click-based interaction that synchronizes with other visualizations (e.g., a bubble chart).

Building the Table

const table = d3.select("#table-container")
  .append("table");

const thead = table.append("thead").append("tr");
thead.selectAll("th")
  .data(columns)
  .join("th")
  .text(d => d.label);

const tbody = table.append("tbody");
const rows = tbody.selectAll("tr")
  .data(data)
  .join("tr")
  .attr("data-ticker", d => d.ticker);

rows.selectAll("td")
  .data(d => columns.map(col => col.accessor(d)))
  .join("td")
  .text(d => d);

Formatting Market Cap

Format large numbers into human-readable form (e.g., 1.64T, 345.98B):

function formatMarketCap(value) {
  if (!value) return "N/A";
  if (value >= 1e12) return (value / 1e12).toFixed(2) + "T";
  if (value >= 1e9) return (value / 1e9).toFixed(2) + "B";
  if (value >= 1e6) return (value / 1e6).toFixed(2) + "M";
  return value.toLocaleString();
}

Click-to-Highlight Synchronization

Pattern: Shared Selection State

Maintain a shared selection state and update both the chart and the table when selection changes.

function selectStock(ticker) {
  // Highlight the table row
  d3.selectAll("#table-container tr")
    .classed("highlighted", d => d && d.ticker === ticker);

  // Highlight the bubble
  d3.selectAll(".bubble")
    .classed("highlighted", d => d.ticker === ticker);

  // Scroll the table row into view
  const row = document.querySelector(`tr[data-ticker="${ticker}"]`);
  if (row) row.scrollIntoView({ behavior: "smooth", block: "center" });
}

Binding Click Events

// On bubble click
bubbles.on("click", (event, d) => selectStock(d.ticker));

// On table row click
rows.on("click", (event, d) => selectStock(d.ticker));

Styling

• Use position: sticky on <thead> for scrollable tables
• Highlight rows with a distinct background color on .highlighted class
• Add hover effects on rows for discoverability
• Use alternating row colors for readability